1. After obtaining VC/WW games, must they be converted to a certain format in order to play through TriiForce?
You just use "ShowMiiWads" to install them to your NAND dump. ShowMiiWads is suuuuuperb btw, so get it
2. TriiForce uses NAND emulation of the HDD instead of the Wii, correct?
ONLY for WiiWare and VC games, not any other channels or other settings etc.
3. Is TriiForce safe from bricking my Wii?
Pretty much, use it as it should be used then there is virtually no chance of a brick.
4. VC/WW games can be saved on the HDD and played on other Wiis, using those same saves?
Yep, so say for example you load your top ten games onto your external nand and have that on a USB pendrive, you can plug that into any other Wii that has cIOS Rev 14, or 15 installed and play. If the other Wii has the newest HBC, then the USB can hold the app and everything else, so the 2nd Wii only needs the cIOS 14, or 15 installed, nothing more.
5. Any additional info to share?
Nope everything is straight forward.